﻿using MY.ShoppingBackstage.DAL;
using MY.ShoppingBackstage.Model;
using System;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace MY.ShoppingBackstage.BLL
{
    public  class BaseService<T> where T : class, new()                                      
    {
        private BaseRepository<T, WaiShopEntities> db = new BaseRepository<T, WaiShopEntities>();

        /// <summary>
        /// 通用新增方法
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public virtual  bool Add(T entity)
        {
            return db.Add(entity);
        }

        /// <summary>
        /// 通用删除
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public virtual  bool Delete(T entity)
        {
            return db.Delete(entity);
         
        }

        /// <summary>
        /// 通用批量删除
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public virtual  bool Delete(List<T> entitys)
        {
            return db.Delete(entitys);
        }
        /// <summary>
        /// 通用批量删除
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public virtual  bool Delete(params int[] ids)
        {
            return db.Delete(ids);
        }

        /// <summary>
        /// 通用修改
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        public virtual  bool Update(T entity)
        {
            return db.Update(entity);
        }

        /// <summary>
        /// 通用查询集合
        /// </summary>
        public virtual  List<T> QueryList(Expression<Func<T, bool>> expression = null)
        {
            return db.QueryList(expression);
        }

        /// <summary>
        /// 查询返回对象
        /// </summary>
        /// <param name="expression"></param>
        /// <returns></returns>
        public virtual  T Query(Expression<Func<T, bool>> expression = null)
        {
            return db.Query(expression);
        }

        /// <summary>
        /// 判断记录是否存在
        /// </summary>
        /// <param name="expression"></param>
        /// <returns></returns>
        public virtual  bool Exists(Expression<Func<T, bool>> expression = null)
        {
            return db.Exists(expression);
        }

        /// <summary>
        /// 分页查询
        /// </summary>
        /// <returns></returns>
        public virtual  List<T> QueryPageList<S>(int pageIndex,int pageSize, Expression<Func<T, bool>> whereExpression, Expression<Func<T, S>> orderExpression, bool isDsc=true)
        {
            return db.QueryPageList(pageIndex, pageSize, whereExpression, orderExpression, isDsc);
        }

        /// <summary>
        /// 返回总数
        /// </summary>
        /// <param name="whereExpression"></param>
        /// <param name="count"></param>
        /// <returns></returns>
        public virtual  int GetCount(Expression<Func<T, bool>> whereExpression,out int count) {
            return  db.GetCount(whereExpression,out  count);
        }

       
    }
}
